A spokeswoman for the U.S. Coast Guard tells The Gloucester Daily Times that crew aboard the 107-foot herring trawler Osprey reported a colleague suffering what appeared to be a "severe asthma attack" at about 3:45 a.m. Sunday.

The boat was about 65 miles from Cape Cod and the Coast Guard ordered the vessel to Gloucester. It arrived at about 4:30 p.m.

The Essex district attorney's office says the death does not appeal suspicious but an autopsy is scheduled. Police say they are investigating the discovery of a "class A substance" on board.

The man was identified as 40-year-old Michael Grindle of Blue Hill, Maine, who had been living in Gloucester while on the crew.